Does anyone know what game that image is from? Did they use ours, or did we use theirs? Is it being used properly according to the license?

All I have learned so far is that the file was uploaded to our repository by Roots on 4-18-2007 in revision 687, along with several other tilesets. It has mostly remained unchanged, about 3 or 4 touchups since then. The file on the clanlib server was last modified last week, but that could mean anything.

UPDATE: I looked in ClanLib latest release and svn. The applicable file is called /Examples/GUICustomComponent/Resources/Images/background.jpg. It was added to svn 5-13-2009 by sphair in revision 2903. I have not yet found an earlier version.